Firewall Rule Deleted Via Netsh.EXE

 1title: Firewall Rule Deleted Via Netsh.EXE
 2id: 1a5fefe6-734f-452e-a07d-fc1c35bce4b2
 3status: test
 4description: Detects the removal of a port or application rule in the Windows Firewall configuration using netsh
 5references:
 6    - https://app.any.run/tasks/8bbd5b4c-b82d-4e6d-a3ea-d454594a37cc/
 7author: frack113
 8date: 2022-08-14
 9modified: 2025-10-07
10tags:
11    - attack.defense-evasion
12    - attack.t1562.004
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    selection_img:
18        - Image|endswith: '\netsh.exe'
19        - OriginalFileName: 'netsh.exe'
20    selection_cli:
21        CommandLine|contains|all:
22            - 'firewall'
23            - 'delete '
24    filter_optional_dropbox:
25        ParentImage|endswith: '\Dropbox.exe'
26        CommandLine|contains: 'name=Dropbox'
27    filter_optional_avast:
28        ParentImage|endswith: '\instup.exe'
29        CommandLine|contains: 'advfirewall firewall delete rule name="Avast Antivirus Admin Client"'
30    condition: all of selection_* and not 1 of filter_optional_*
31falsepositives:
32    - Legitimate administration activity
33    - Software installations and removal
34level: medium